Unicellular

unicellular (cytoplasmic) organization The life-form in which all functions are carried out within the confines of a single plasma membrane; members of the kingdom Protista display unicellular organization; also called cytoplasmic organization.

unicellular Single-celled. uniformitarianism The idea that geological processes have remained uniform over time and that slight changes over long periods can have large-scale consequences; proposed by James Hutton in 1795 and re?

Unicellular or multicellular photosynthetic eukaryotes that generally lack roots, stems, leaves, conducting vessels, and complex sex organs. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...

unicellular microbes like E. coli unicellular eukaryotes like yeast and in mammalian cells grown in tissue culture.

unicellular Describing tissues, organs or organisms consisting of a single cell. unisexual Describing animals and plants possessing either male or female reproductive organs, but not both. univalent An unpaired chromosome at meiosis.

Unicellular organisms may also respond to environmental stimuli via the activation of signal transduction pathways. For example slime molds secrete cyclic AMP upon starvation which stimulates individual cells in the immediate environment to aggregate.

unicellular made up of one cell. upper epidermis the tissue in plants, usually one cell thick, that is on the top surface of the leaf.

A unicellular fungus that lives in liquid or moist habitats, primarily reproducing asexually by simple cell division or by budding of a parent cell. yolk The stored food in egg cells that nourishes the embryo.

Most unicellular organisms are microscopic in size, but there are some giant bacteria and protozoa that are visible to the naked eye.

Spore Unicellular often environmentally resistant dormant or reproductive body produced by plants and some microorganisms and capable of development into a new individual either directly or after fusion with another spore.

A unicellular form of fungi. Some fungi (for example Saccharomyces cerevisiae) are only known to reproduce as yeast while other fungi (for example, Candida albicans) are dimorphic, ...

diatoms Unicellular and eukaryotic autotrophs with a siliceous frustule; mostly planktonic. dichotomous Pertaining to the division or forking of a single axis into two branches.

spherical unicellular organism Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...

microscopic unicellular algae. most are aquatic, being found in fresh, brackish, and salt water. Diatoms are noted for the symmetry and sculpturing of their siliceous cell walls.

Cyanobacteria: Unicellular, photosynthetic (photo-autotroph) prokaryote (in the Kingdom Monera). Formerly known as blue-green algae. It contains chlorophyll a but not chloroplast. They reproduce by fission and never sexually.

In addition, only unicellular organisms (or organisms with totipotent cell lines) can have an evolutionary benefit from this mode of mutation.

Flagellum - an extension on many unicellular organisms that enables movement through whip-like motions ...

The kingdom Protista as it now stands includes the unicellular and a few simple multicellular eukaryotic organisms with no well defined tissues or organs.

Prochlorococcus and Synechococcus are unicellular picoplankton, which are major biomass producers in the world's temperate and tropical oceans.

(See the Proteins and Proteomics unit.) In 2003 Roderick MacKinnon and his colleagues used this technique to examine the structure of a voltage-gated potassium channel from a unicellular archaea.

All living organisms, whether unicellular or multicellular exhibit homeostasis.

colonial -- Condition in which many unicellular organisms live together in a somewhat coordinated group. Unlike true multicellular organisms, the individual cells retain their separate identities, and usually, their own membranes and cell walls.

Acetabularia - genus of unicellular marine algae. These organisms comprise an enormous single cell consisting of a cap, stalk and rhizoid and can be up to 10 cm in size.

The Subkingdom of the Kingdom Animalia, in older classification systems, that includes all unicellular organisms that lack differentiated tissues and that primarily reproduce through asexual means, although conjugation does occur.

eukaryote A unicellular or multicellular organism with cells having a membrane-bounded nucleus. All possess, in addition, multiple chromosomes and internal organelles.

See also: Organ, Plant, Trans, Cells, Cell